
   function scroll(){
    //console.log("打印log日志");实时看下效果
    console.log("开始滚动！");
   }
 
   var scrollFunc = function (e) { 
    e = e || window.event; 
    if (e.wheelDelta) { //第一步：先判断浏览器IE，谷歌滑轮事件    
     if (e.wheelDelta > 0) { //当滑轮向上滚动时 
      console.log("滑轮向上滚动"); 
     } 
     if (e.wheelDelta < 0) { //当滑轮向下滚动时 
      console.log("滑轮向下滚动"); 
     } 
    } else if (e.detail) { //Firefox滑轮事件 
     if (e.detail> 0) { //当滑轮向上滚动时 
      console.log("滑轮向上滚动"); 
     } 
     if (e.detail< 0) { //当滑轮向下滚动时 
      console.log("滑轮向下滚动"); 
     } 
    } 
   }
   //给页面绑定滑轮滚动事件 
   if (document.addEventListener) {//firefox 
    document.addEventListener('DOMMouseScroll', scrollFunc, false); 
   } 
   //滚动滑轮触发scrollFunc方法 //ie 谷歌 
   window.onmousewheel = document.onmousewheel = scrollFunc;